LINCOLN, Nebraska (AP) - Nebraska health clinics serving low-income residents say more women are seeking prenatal care in the first trimester of their pregnancies, when problems are the easiest to treat.

Lawmakers approved the measure last year over the veto of Gov. Dave Heineman. The law pitted lawmakers who viewed it as a children's health issue against those who argued it rewarded illegal immigrants.

The percentage of pregnant women seeking first-trimester care at Omaha's OneWorld Community Health Center increased from 78 percent before coverage was available to 85 percent in the last four months of 2012.

Fremont Sen. Charlie Janssen has introduced a bill to repeal the law. Heineman wants to end funding for the effort.